xpath与正则表达式的区别

转载自https://www.cnblogs.com/dyfblog/p/6073069.html

xpath获取URL列表：

以博客园首页为例，如果我们需要的数据是文章

的 url 列表,最好使用 XPath，见图

xpath与正则表达式的区别

#coding:utf8
from lxml import etree
import requests

url = 'http://www.cnblogs.com/'

response = requests.get(url)
response.encoding = 'utf8'
html = response.text

root = etree.HTML(html)
node_list = root.xpath("//div[@class='post_item_body']/h3/a")

for node in node_list:
print node.attrib['href']

# 输出
'''
http://www.cnblogs.com/olivers/p/6073506.html
http://www.cnblogs.com/-free/p/6073496.html
...
'''